Emily Blunt

Ricardo DeAratanha / Los Angeles Times; Zade Rosenthal / Marvel

The movie: Marvel's "Iron Man 2"

The role: Black Widow, a femme fatale formerly known as a Russian spy.

The final pick: Scarlett Johansson. Blunt passed on the role saying: "Usually the female parts in a superhero film feel thankless: She's the pill girlfriend while the guys are whizzing around saving the world."

The movie: Marvel's "Iron Man 2"

The role: Black Widow, a femme fatale formerly known as a Russian spy.

The final pick: Scarlett Johansson. Blunt passed on the role saying: "Usually the female parts in a superhero film feel thankless: She's the pill girlfriend while the guys are whizzing around saving the world."

(Ricardo DeAratanha / Los Angeles Times; Zade Rosenthal / Marvel)

The movie: Marvel's "Iron Man 2"

The role: Black Widow, a femme fatale formerly known as a Russian spy.

The final pick: Scarlett Johansson. Blunt passed on the role saying: "Usually the female parts in a superhero film feel thankless: She's the pill girlfriend while the guys are whizzing around saving the world."